. Off-hand sketches : a companion for the tourist and traveller over the Philadelphia, Pottsville, and Reading railroad . FIGURE rugged ridges, with narrow intervening valleys. Valleys of undula-tion, however, are produced directly by two neighboring elevations, which, by lifting the strata oneither side without occasioningfracture, leave the valley is the most usual structure ofthe coal beds of Schuylkill County,fig. 46, and hence it follows thatthat county contains a much greateramount of mineral, in proportionto the superficial area, than any other district in the United S
. Off-hand sketches : a companion for the tourist and traveller over the Philadelphia, Pottsville, and Reading railroad . FIGURE rugged ridges, with narrow intervening valleys. Valleys of undula-tion, however, are produced directly by two neighboring elevations, which, by lifting the strata oneither side without occasioningfracture, leave the valley is the most usual structure ofthe coal beds of Schuylkill County,fig. 46, and hence it follows thatthat county contains a much greateramount of mineral, in proportionto the superficial area, than any other district in the United whole county is but a succession of wave-like elevations, withnarrow intervening valleys, all of which are full of the valuablemineral for which the region is so remarkable. Valleys of erosionare formed by the action of water. Imagine a nearly level plain, andthen, at one end of it let a stream of water issue forth: in a compa-ratively short time, with the assistance of snows and rains, and alter-nate dry seasons, it will scoop out a hollow similar to fig. 47, while,in course of time, it will form a deep valley, surro
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Keywords: ., bookcentury1800, bookdecade1850, bookidoffhandsketc, bookyear1854
